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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第9期    总第241期    2014年9月

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文章编号:1672-7207(2014)09-3093-11
浅埋偏压矩形单洞隧道围岩压力极限上限分析方法
赵炼恒1,黄阜2,孙秋红1, 3,项志敏4,罗伟1

(1. 中南大学 土木工程学院,湖南 长沙,410075;
2. 长沙理工大学 土木与建筑学院,湖南 长沙,410004;
3. 中铁二十五局集团有限公司第二工程公司,湖南 衡阳,421000;
4. 中国中铁航空港建设集团有限公司,北京,100093
)

摘 要: 探讨将极限平衡理论引入浅埋隧道围岩压力分布进行浅埋隧道围岩压力上限计算的可行性。针对偏压浅埋矩形单洞隧道情况,通过引入水平偏压荷载系数的方式,讨论浅埋偏压矩形单洞隧道围岩压力的上限分析方法,并对获得的隧道围岩压力目标函数采用非线性规划方法进行优化计算。结果表明:水平和倾斜地表条件下,本文方法计算结果与已有计算结果均接近,可以证明本文方法的有效性。地表倾斜角度、围岩抗剪强度参数、隧道埋深、围岩容重和围岩计算内摩擦角均对浅埋偏压矩形单洞隧道围岩压力和破坏机构存在显著影响;极限平衡状态下偏压浅埋隧道会出现显著的非对称性破坏,破坏范围整体向埋深较大一侧偏转,工程实际应用中偏压效应和正确计算参数选取对分析偏压浅埋隧道稳定性极为重要。

 

关键字: 隧道工程;浅埋偏压隧道;围岩压力;极限分析上限法;非线性规划方法

Rock pressure of unsymmetrical shallow rectangular tunnel based on upper bound limit analysis method
ZHAO Lianheng1, HUANG Fu2, SUN Qiuhong1, 3, XIANG Zhimin4, LUO Wei1

1. College of Civil and Architectural Engineering, Central South University, Changsha 410075, China;
2. School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410004, China;
3. The Second Engineering Company, China Railway Twenty-fifth Engineering Group Co., Ltd., Hengyang 421000, China;
4. China Railway & Airport Construction Group Corporation, Beijing 100093, China

Abstract:By introducing the limit equilibrium theory into the distribution model of surrounding rock pressure for unsymmetrical shallow rectangular tunnel, the viability of surrounding rock pressure calculated by upper bound theorem was discussed. Aiming at the shallow bias tunnel, the upper bound analysis method for surrounding rock pressure was studied by introducing the horizontal bias loading coefficient, and the objective function of surrounding rock pressure was optimized by nonlinear programming method. The comparing analysis results show that the solutions derived from this paper is close to the existing results, which proved the validity of the present method. Moreover, the surface inclined angle, shear strength parameters of surrounding rock, tunnel depth, bulk density of surrounding rock and the calculation friction angle all have significant influence on the surrounding rock pressure and failure mechanism of shallow bias tunnel. The unsymmetrical failure mechanism would appear under limit equilibrium state in shallow bias tunnel, and the damage range deflects to the deep embedded side. Therefore, the effect of the bias voltage and the selection of calculating parameter are important for stability analysis of shallow bias tunnel in practical engineering.

 

Key words: tunnel engineering; unsymmetrical shallow tunnel; rock pressure; limit analysis upper bound method; nonlinear programming method

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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